Burgh Island is a tidal island on the coast of South Devon in England near the small seaside village of Bigbury-on-Sea. There are several buildings on the island, the largest being the Art Deco Burgh Island Hotel. The other buildings are three private houses, and a pub, the Pilchard Inn, which dates to the 14th century. The island is strongly associated with writer Agatha Christie, who often visited and used the island and its hotel as a setting and inspiration for two famous novels: And Then There Were None (1939) and Evil Under the Sun (1941).

A tidal island is a raised area of land within a waterbody, which is connected to the larger mainland by a natural isthmus or man-made causeway that is exposed at low tide and submerged at high tide, causing the land to switch between being a promontory/peninsula and an island depending on tidal conditions.